以下为句子列表：
英文: By keeping this center of mass closer to the rotor disc the pendulum effect is reduced and the helicopter is markedly more stable.
中文: 靠着这种质心接近转子盘钟摆效应,减少了直升机着较为稳定.
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英文: For example, an elephant's four tree trunk-like legs keep its center of mass over its feet, while T. rex would have had to balance its mass differently over its two small legs, bending them to keep from toppling over.
中文: 比如，大象的树干般的四条腿能让它的质心保持在腿上，而暴龙必须通过将让它们弯曲以避免摔倒，而用不同地方式在两条腿上保持平衡。
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英文: For the main engineering problems in obstacle navigation, the difficulties in the obstacle navigation phase are analyzed theoretically, i. e. adjusting the center of mass and identifying and localizing the power line.
中文: 主要针对越障的工程实际问题，从理论上分析了越障阶段的难点：质心调节，输电线的辨识与定位问题。
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英文: The center of mass is important to consider because two animals with similar weights may move in different ways depending on how their mass is distributed.
中文: 质心是重要的考虑因素，因为相似体重的两只动物可能根据质量如何分部不同，而采取不同的行动方式。
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英文: The moment formed by COP with the whole body center of mass would then be analyzed to investigate the kinematic characteristics of the body.
中文: 此外，在二维运动学资料中，上旋发球较平击发球于加速期时生成较多的膝关节弯曲，同时在骨盆生成较多的后倾，如此可帮助增加发球时之动量生成及传递。
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